公开(公告)号：US09131029B1

公开(公告)日：2015-09-08

申请号：US14246330

申请日：2014-04-07

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Eldad Perahia ,  Bretton Douglas ,  David Pignatelli ,  David Stephenson

IPC: H04L27/28 ,  H04L29/06 ,  H04W72/04

CPC classification number: H04L65/601 ,  H04B7/0413 ,  H04B7/10 ,  H04L1/0083 ,  H04L1/1607 ,  H04L1/1854 ,  H04L2001/0093 ,  H04W16/28 ,  H04W52/04 ,  H04W72/0406 ,  H04W88/10

Abstract: Multiple Input Multiple Output (MIMO) technology in conjunction with the IEEE 802.11 standard enables simultaneous communication of data packets to or from multiple users in the same frequency. Spatial divisional multiple access (SDMA) is thus provided. In this way, system capacity can be increased to an extent that depends on available antenna resources and the multipath characteristics of the communication channel. Doubling or quadrupling of network throughput can be achieved.

Abstract translation: 结合IEEE 802.11标准的多输入多输出（MIMO）技术可以实现与同一频率的多个用户的数据包同时通信。 因此提供了空分多址（SDMA）。 以这种方式，可以将系统容量增加到取决于可用天线资源和通信信道的多径特性的程度。 可以实现网络吞吐量的两倍或四倍。

公开(公告)号：US09236928B1

公开(公告)日：2016-01-12

申请号：US14082666

申请日：2013-11-18

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Ozgur Gurbuz ,  David Pignatelli ,  David Stephenson ,  Eldad Perahia ,  Bretton Douglas ,  Ender Ayanoglu

IPC: H04B7/08 ,  H04B7/06 ,  H04W28/18 ,  H04B7/04 ,  H04W28/22 ,  H04W84/12

CPC classification number: H04B7/0689 ,  H04B7/0413 ,  H04B7/0628 ,  H04B7/0871 ,  H04W28/22 ,  H04W84/12

Abstract: An apparatus and method for operating a Multiple Input Multiple Output (MIMO)-capable subscriber node are disclosed. In one embodiment, an apparatus includes a MIMO-capable physical layer transceiver and a Medium Access Control (MAC) layer block that measures a received transmission to determine channel conditions. Upon receiving a transmission wherein said channel conditions meet specified conditions, the MAC layer block transmits a message to an access point indicating that the apparatus wants to switch between a non-MIMO mode and a MIMO mode, and upon receiving an acknowledgement, the MAC layer block switches between the non-MIMO mode and the MIMO mode. An apparatus for operating an access node is also disclosed.

Abstract translation: 公开了一种用于操作多输入多输出（MIMO）能力的用户节点的装置和方法。 在一个实施例中，一种装置包括MIMO能力的物理层收发机和媒体接入控制（MAC）层块，其测量接收到的传输以确定信道状况。 在接收到所述信道条件满足指定条件的传输时，MAC层块向接入点发送指示设备在非MIMO模式和MIMO模式之间切换的消息，并且在接收到确认时，MAC层 在非MIMO模式和MIMO模式之间进行块切换。 还公开了一种用于操作接入节点的装置。

公开(公告)号：US20150207554A1

公开(公告)日：2015-07-23

申请号：US14670051

申请日：2015-03-26

Applicant: Cisco Technology, Inc.

Inventor： Eldad Perahia ,  Bretton Lee Douglas ,  Brian Hart ,  Daniel Joseph Lyons

IPC: H04B7/06 ,  H04L27/26 ,  H04L25/02

CPC classification number: H04B7/0608 ,  H04B7/0602 ,  H04B7/0615 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/03343 ,  H04L27/2601 ,  H04L2027/0095 ,  H04W84/12

Abstract: A method and an apparatus in a first wireless station of a network transmitting to a second wireless station. The network uses multi-tone OFDM signals. The first station includes multiple antennas and a receive and a transmit signal path per antenna. Each receive signal path includes a discrete Fourier transformer determining the tones in a received signal, and each transmit signal path includes an inverse discrete Fourier transformer converting tones to a signal. The method includes determining channel estimates for each tone and each receive path while receiving from the second station, determining transmit weights to transmit to the second station, tone-by-tone weighting a signal for transmission to the second station to produce weighted tone sets for each transmit signal path, and transmitting the weighted tone sets. The first station is configured so that the weighting produces additive beamforming without the second station needing multiple antennas.

Abstract translation: 一种发送到第二无线站的网络的第一无线站中的方法和装置。 网络使用多音频OFDM信号。 第一站包括多个天线以及每个天线的接收和发射信号路径。 每个接收信号路径包括确定接收信号中的音调的离散傅里叶变换器，并且每个发射信号路径包括将音调转换为信号的离散傅立叶变换逆变换器。 该方法包括确定每个音调和每个接收路径的信道估计，同时从第二站接收确定发送权重以发送给第二站，逐个音调加权信号以传输到第二站以产生加权音调集合 每个发送信号路径，并发送加权音调集。 第一站被配置为使得加权产生加法波束成形，而不需要第二站需要多个天线。

公开(公告)号：US09054934B1

公开(公告)日：2015-06-09

申请号：US14134050

申请日：2013-12-19

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Eldad Perahia ,  Bretton Douglas ,  David Pignatelli

IPC: H04L27/06 ,  H04L27/26 ,  H04B7/04 ,  H04L25/02

CPC classification number: H04L27/2655 ,  H04B7/0413 ,  H04B7/10 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0202 ,  H04L25/0226

Abstract: A specialized preamble is provided to facilitate matrix channel estimation of a MIMO channel. In a particular implementation, a channel training preamble provided by the IEEE 802.11a standard is modified to facilitate MIMO channel estimation.

Abstract translation: 提供专用前置码以便于MIMO信道的矩阵信道估计。 在特定实现中，由IEEE 802.11a标准提供的信道训练前导码被修改以便于MIMO信道估计。

公开(公告)号：US08644430B1

公开(公告)日：2014-02-04

申请号：US13664218

申请日：2012-10-30

Applicant: Cisco Technology, Inc.

Inventor： Eldad Perahia ,  Bretton Douglas ,  David Pignatelli

IPC: H04L27/06

CPC classification number: H04L27/2655 ,  H04B7/0413 ,  H04B7/10 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0202 ,  H04L25/0226

Abstract: A specialized preamble is provided to facilitate matrix channel estimation of a MIMO channel. In a particular implementation, a channel training preamble provided by the IEEE 802.11a standard is modified to facilitate MIMO channel estimation.

Abstract translation: 提供专用前置码以便于MIMO信道的矩阵信道估计。 在特定实现中，由IEEE 802.11a标准提供的信道训练前导码被修改以便于MIMO信道估计。